Composition of bleaching agents



' an elevatedtemperature lution of the sodium-salt of p-toluenesulfokali metal 5 Patented Dec. 13, 1932 OF RADEBEUL, GERMANY,

re atta ASSIGNOR TO CHEMISCHE FABRIK VON HEYDEN, A. G., 0F RADEBEU I1, NEAR DRESDEN, GERMANY, A CORPORATION OF COMPOSITION OF BLEACHING AGENTS Ho Drawing. Application filed October 25, 1928, Serial No. 315,107, and in Germany March 1, 1928.

This invention relates to bleaching agents and it particularly relates to dry mixtures of such bleaching agents, which can be conveniently stored and shipped in suitable containers and only when theyare dissolved in water, yield solutions suitable for bleaching and the action of which is based on the spl1tting off of active chlorine upon their coming in contact with water.

With this end in view I mix the known dichlorides of aromatic sulfoamides, such as for instance p-toluenesulfodichloramides, with a salt of alkaline reaction, such as dry sodiumcarbonate,sodiumtriphosphate,borax, or the like alkali metal salts. The mixtures of these aforesaid substances are perfectly inactive when dry, but when dissolved in water these alkaline salts react with the dichlorides of these aromatic sulfoamides.

" It appears that by dissolving the aforesaid p-toluenesulfodichloramide salt of alkaline reaction the transformed into one molemixture of the and of a sodium dichloramide is cule of the sodium p-toluenesulfochloramide' and one molecule of sodium hypochlorite. A solution containing this mixture has a twofold advanta e insofar as its content of the generated sodium hypochlorite causes it to act at the usual temperature and the presence of the sodium p-toluenesulfochloramide exerts a slow bleaching action, often only when heated to an elevated temperature. The so lutions obtained from these dry mixtures combine, therefore, the virtues of these two ty es of bleaching agents.

I am aware that it has been tried to bleach textile materials, such as wool, silk and the like, or fabrics made of the same, first at the usual temperature with an aqueous solution of sodium hypochlorite, and subsequently at with an aqueous so chloramide.

y new invention, however, is based on the fact that I produce stable dry mixtures, which, upon their being dissolved in water, exert the combined bleaching effect of both the alkalimetal-hypochlorite and of the alsalt of p-toluenesulfochloramid.

these two parasmuch as mixtures of ticular substances, however, cannot be produced in stable form, particularly as alkalimetalhypochlorites easily undergo decomposition, there was, therefore, no way to manuvfacture dry stable mixtures of bleaching agents for the intended purpose.

It is therefore the essence of my invention that I am able to produce such stable mixtures by adding to p-toluenesulfodichloramides, and analogous compounds, dry alkali metal salts of alkaline reaction and that these mixtures only allow the formation of the bleaching agents upon their coming into contact with water.

Theingredients of the mixture may be brought together in stoichiometrical proportions, or one or the other substance, for in stance the alkaline salt, may predominate. Instead of p-toluenesult'odichloramid I may use as well the dichloramides of other sulfonic acid, for instance of the benzenesulfonic acid, the naphthaleue-sulfonic acid and other homologous acids. A

The following example shows how I proceed in carrying my invention into effect:

E exam ple I mix 1 part of dry p-toluenesulfodichloramide, 4 parts of calcined sodium carbonate and to make a stock solution 1 dissolve the mixture in 810 parts of water. I have found that in laundry work a particularly beneficial effect is obtained if the aforesaid stock solution is diluted 3 to 5 times its volume.

What I claim is:

l. A solid and stable bleaching agent consisting of a dry mixture of a dichloride of an aromatic sulfoamide and of a watersoluble salt of alkaline reaction, which mixture, when treated with bleaching solution containing an hypochlo rite.

2. A'solid and stable bleaching agent, con sisting of a dry mixture of dichloride of an aromatic sulfoainide and of an alkali metal salt of alkalinereaction, the mixture, when treated with water, yielding a bleaching solution containing an hypochlorite.

3. A solid and stable bleaching agent, con- ;isting of a dry mixture of p-toluenesulfodi- :hloramide and, of a water-soluble salt of alkaline reaction, said mixture when treat ed with Water yielding a bleaching solution containing an hypochlorite.

4. A solid and stable bleaching agent, consistingv of a dry mixture of a. p-toluenesulfodichloramide and of an alkaline metal salt of alkali reaction, the mixture when treated with water, yielding a bleaching solution, which contains an hypochlorite.

5. A solid and stable bleaching agent, comprising a dry mixture of p-toluenesulfodichloramlde and sodium carbonate, said mixture yielding a bleaching solution when treated with water. I

In testimony whereof I have hereunto set my hand.

RICHARD FEIBELMANN. 

